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This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
213 lines
5.6 KiB
C
213 lines
5.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#include <syslog.h>
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static void nuke_str(char *str)
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{
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if (str) memset(str, 0, strlen(str));
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}
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static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
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{
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char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
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char *orig = (char*)"";
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char *newp = NULL;
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char *cp = NULL;
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char *ret = NULL; /* failure so far */
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if (myuid && pw->pw_passwd[0]) {
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char *encrypted;
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orig = bb_ask_stdin("Old password: "); /* returns ptr to static */
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if (!orig)
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goto err_ret;
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encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
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if (strcmp(encrypted, pw->pw_passwd) != 0) {
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syslog(LOG_WARNING, "incorrect password for %s",
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pw->pw_name);
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bb_do_delay(FAIL_DELAY);
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puts("Incorrect password");
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goto err_ret;
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}
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if (ENABLE_FEATURE_CLEAN_UP) free(encrypted);
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}
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orig = xstrdup(orig); /* or else bb_ask_stdin() will destroy it */
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newp = bb_ask_stdin("New password: "); /* returns ptr to static */
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if (!newp)
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goto err_ret;
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newp = xstrdup(newp); /* we are going to bb_ask_stdin() again, so save it */
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if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
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&& obscure(orig, newp, pw) && myuid)
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goto err_ret; /* non-root is not allowed to have weak passwd */
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cp = bb_ask_stdin("Retype password: ");
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if (!cp)
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goto err_ret;
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if (strcmp(cp, newp)) {
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puts("Passwords don't match");
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goto err_ret;
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}
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crypt_make_salt(salt, 1, 0); /* des */
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if (algo) { /* MD5 */
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strcpy(salt, "$1$");
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crypt_make_salt(salt + 3, 4, 0);
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}
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/* pw_encrypt returns malloced str */
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ret = pw_encrypt(newp, salt, 1);
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/* whee, success! */
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err_ret:
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nuke_str(orig);
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if (ENABLE_FEATURE_CLEAN_UP) free(orig);
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nuke_str(newp);
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if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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nuke_str(cp);
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return ret;
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}
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int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int passwd_main(int argc UNUSED_PARAM, char **argv)
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{
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enum {
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OPT_algo = 0x1, /* -a - password algorithm */
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OPT_lock = 0x2, /* -l - lock account */
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OPT_unlock = 0x4, /* -u - unlock account */
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OPT_delete = 0x8, /* -d - delete password */
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OPT_lud = 0xe,
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STATE_ALGO_md5 = 0x10,
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//STATE_ALGO_des = 0x20, not needed yet
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};
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unsigned opt;
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int rc;
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const char *opt_a = "";
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const char *filename;
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char *myname;
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char *name;
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char *newp;
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struct passwd *pw;
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uid_t myuid;
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struct rlimit rlimit_fsize;
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char c;
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#if ENABLE_FEATURE_SHADOWPASSWDS
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/* Using _r function to avoid pulling in static buffers */
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struct spwd spw;
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char buffer[256];
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#endif
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logmode = LOGMODE_BOTH;
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openlog(applet_name, 0, LOG_AUTH);
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opt = getopt32(argv, "a:lud", &opt_a);
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//argc -= optind;
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argv += optind;
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if (strcasecmp(opt_a, "des") != 0) /* -a */
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opt |= STATE_ALGO_md5;
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//else
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// opt |= STATE_ALGO_des;
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myuid = getuid();
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/* -l, -u, -d require root priv and username argument */
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if ((opt & OPT_lud) && (myuid || !argv[0]))
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bb_show_usage();
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/* Will complain and die if username not found */
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myname = xstrdup(xuid2uname(myuid));
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name = argv[0] ? argv[0] : myname;
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pw = xgetpwnam(name);
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if (myuid && pw->pw_uid != myuid) {
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/* LOGMODE_BOTH */
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bb_error_msg_and_die("%s can't change password for %s", myname, name);
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}
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#if ENABLE_FEATURE_SHADOWPASSWDS
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{
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/* getspnam_r may return 0 yet set result to NULL.
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* At least glibc 2.4 does this. Be extra paranoid here. */
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struct spwd *result = NULL;
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errno = 0;
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if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result) != 0
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|| !result /* no error, but no record found either */
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|| strcmp(result->sp_namp, pw->pw_name) != 0 /* paranoia */
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) {
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if (errno != ENOENT) {
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/* LOGMODE_BOTH */
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bb_perror_msg("no record of %s in %s, using %s",
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name, bb_path_shadow_file,
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bb_path_passwd_file);
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}
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/* else: /etc/shadow does not exist,
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* apparently we are on a shadow-less system,
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* no surprise there */
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} else {
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pw->pw_passwd = result->sp_pwdp;
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}
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}
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#endif
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/* Decide what the new password will be */
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newp = NULL;
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c = pw->pw_passwd[0] - '!';
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if (!(opt & OPT_lud)) {
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if (myuid && !c) { /* passwd starts with '!' */
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/* LOGMODE_BOTH */
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bb_error_msg_and_die("can't change "
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"locked password for %s", name);
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}
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printf("Changing password for %s\n", name);
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newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
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if (!newp) {
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logmode = LOGMODE_STDIO;
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bb_error_msg_and_die("password for %s is unchanged", name);
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}
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} else if (opt & OPT_lock) {
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if (!c) goto skip; /* passwd starts with '!' */
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newp = xasprintf("!%s", pw->pw_passwd);
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} else if (opt & OPT_unlock) {
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if (c) goto skip; /* not '!' */
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/* pw->pw_passwd points to static storage,
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* strdup'ing to avoid nasty surprizes */
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newp = xstrdup(&pw->pw_passwd[1]);
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} else if (opt & OPT_delete) {
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//newp = xstrdup("");
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newp = (char*)"";
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}
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rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
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setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
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bb_signals(0
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+ (1 << SIGHUP)
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+ (1 << SIGINT)
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+ (1 << SIGQUIT)
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, SIG_IGN);
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umask(077);
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xsetuid(0);
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#if ENABLE_FEATURE_SHADOWPASSWDS
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filename = bb_path_shadow_file;
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rc = update_passwd(bb_path_shadow_file, name, newp, NULL);
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if (rc == 0) /* no lines updated, no errors detected */
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#endif
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{
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filename = bb_path_passwd_file;
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rc = update_passwd(bb_path_passwd_file, name, newp, NULL);
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}
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/* LOGMODE_BOTH */
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if (rc < 0)
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bb_error_msg_and_die("can't update password file %s",
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filename);
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bb_info_msg("Password for %s changed by %s", name, myname);
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//if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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skip:
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if (!newp) {
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bb_error_msg_and_die("password for %s is already %slocked",
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name, (opt & OPT_unlock) ? "un" : "");
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}
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if (ENABLE_FEATURE_CLEAN_UP) free(myname);
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return 0;
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}
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